RAM Memory between ML 350 Gen6 & Gen8

I have two servers, an ML 350 G6 and an ML 350e Gen8. I am looking to increase the RAM memory on both boxes and hoping to keep as much of the meomry I currenl;y have. The Gen8 has four 8Gb RDIMM's that I would like to place on the G6 (with one more purchsed new for this). The part numbers for the memory differ between these boxes even though all the specs on the memory are identical. Is it possible to use the Gen* memory on the G6?